I have an Aquara Mini Wireless (Aqara Wireless Mini Switch WXKG11LM Zigbee compatibility) previously connected via Zigbee2MQTT and that I wanted to join a ZHA network (I am moving from Z2M to ZHA).
First, it did not show up at all, then was stuck in starting interview.
I removed the battery for 30 minutes (it helped me in the past) and then tried again. I was clicking everything during the interview (the main button and the pairing button) and, behold, it got paired at last!
As unk_model by unk_manufacturer 
I am writing this here for the ones who are trying - do not lose hope! I will open a new question for this unk_model thing…
EDIT: I removed the device and re-added it. This time it worked, waaaaay quicker than the first time. The model is correctly recognized now.
This Zigbee protocol is really weird.